Here's a simple Friday guide on how to torque the wheel lug nuts on a
vanagon:
Using a 1/2" drive with a 17 1/2" extension,
our own in-house research department determined the following:
After considerable torque-testing, we arrived at these practical figures:
1) If you are a gentle person of slight build,
    tighten the nuts harder than you can.
2) If you are a person of medium build,
    tighten the nuts as hard as you can.
3) If you are big, strong, and work-out regularly,
    tighten the nuts almost as hard as you can.

Happy to be of assistance.
Harald
'90 westy